EVAL5987A [STMICROELECTRONICS]
3 A step-down switching regulator demonstration board based on the L5987, L5987A; 3一个降压型开关稳压器演示板基础上， L5987 ， L5987A
| 型号： | EVAL5987A |
| 厂家： | 
ST |
| 描述： | 3 A step-down switching regulator demonstration board based on the L5987, L5987A |
| 文件： | 总6页 (文件大小：286K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVAL5987
EVAL5987A
3 A step-down switching regulator demonstration board
based on the L5987, L5987A
Data brief
Features
■ 3 A DC output current
■ 2.9 V to 18 V input voltage
■ Output voltage adjustable from 0.6 V to 16 V
■ 250 kHz switching frequency, programmable
up to 1 MHz
■ Internal soft-start and inhibit
■ Low dropout operation: 100% duty cycle
■ Zero-load current operation
■ Overcurrent and thermal protection
■ VFQFPN8 3 mm x 3 mm package or HSOP8
!-ꢀꢁꢂꢀꢃVꢂ
for the L5987A
Description
The compensation network on the demonstration
board allows the use of MLCC as output filter to
keep the loop stable. The inductor saturation
current and forward current of the Schottky diode
are within the current limit values.
The EVAL5987/A demonstration board provides
the design engineer with a fully functional step-
down switching regulator with an output current of
up to 3 A. The board integrates
STMicroelectronics’ L5987/A step-down switching
regulator, together with all the external
The switching frequency on the demonstration
board is set to 500 kHz by means of the R5
resistor connected to pin Fsw.
components required for a typical application.
The rated voltage of the input capacitor and the
Schottky diode rectifier repetitive peak reverse
voltage are both 25 V, making the board capable
of covering the entire 2.9 V - 18 V input voltage
range of the L5987/A device.
The board features an external resistor divider
(R1 and R2) designed for an output voltage
of 1.8 V.
The output voltage can be set to a level from 0.6 V
up to the input voltage.
November 2009
Doc ID 16613 Rev 1
1/6
For further information contact your local STMicroelectronics sales office.
www.st.com
6
EVAL5987/A application circuit and component list
EVAL5987 - EVAL5987A
1
EVAL5987/A application circuit and component list
Figure 1.
Application circuit
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Figure 2.
Package
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Table 1.
Component list
Part number
Reference
Description
Manufacturer
C1
C2
C3
C4
C5
C6
R1
R2
R3
R4
R5
L1
GRM32ER61E226KE15
22 µF, 25 V
22 µF, 25 V
Murata
Murata
GRM32ER61E226KE15
2.2 nF, 50 V
10 nF, 50 V
330 pF, 50 V
220 nF, 25 V
4.99 kΩ, 1%, 0.1 W 0603
2.49 kΩ, 1%, 0.1 W 0603
330 Ω, 1%, 0.1 W 0603
2 kΩ, 1%, 0.1 W 0603
100 kΩ, 1%, 0.1 W 0603
5.2 µH, 30%, 5.28 A
2 A, 25 V
MSS1038-522NL
STPS2L25V
Coilcraft
D1
STMicroelectronics
2/6
Doc ID 16613 Rev 1
EVAL5987 - EVAL5987A
PCB layout
2
PCB layout
Figure 3.
PCB layout (component side)
Figure 4.
PCB layout (bottom side)
Figure 5.
PCB layout (front side)
Doc ID 16613 Rev 1
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Package mechanical data
EVAL5987 - EVAL5987A
3
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
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EVAL5987 - EVAL5987A
Revision history
4
Revision history
Table 2.
Date
04-Nov-2009
Document revision history
Revision
Changes
1
Initial release
Doc ID 16613 Rev 1
5/6
EVAL5987 - EVAL5987A
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